Daikin R32 SPLIT Serie Manuel D'installation page 20

WARNING
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would
reduce the lifetime of the units.
• Never use piping which has been used for previous installations.
• Only use parts which are delivered with the unit.
• Do never install a drier to this R32 unit in order to guarantee its
lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
CAUTION
Do not reuse joints which have been used once already.
4
CAUTION
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)
3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque
wrenches.
[Apply oil]
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
1. Cautions on pipe handling
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible.
Use a pipe bender for bending.
2. Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/(mh •˚C)
Refrigerant gas pipe's surface temperature reaches 110˚C max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Gas side Liquid side
O.D. 12.7mm O.D. 6.4mm
Minimum bend radius
40mm or more 30mm or more
Thickness 0.8mm
(C1220T-O)
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
REFRIGERANT PIPING
Apply refrigeration oil to the
inner surface of the flare.
Gas pipe thermal insulation
I.D. 14-16mm
Ø Tube, D
Inch
1/4"
3/8"
1/2"
5/8"
3/4"
Flare's inner surface
must be flaw-free
Pipe Size, mm (in) Torque, Nm/(ft-lb)
Rain
Liquid pipe thermal insulation
I.D. 8-10mm
Thickness 10mm Min.
1-18
A (mm)
mm Imperial
(Wing-nut Type) (Clutch Type)
6.40 1.3
9.52 1.6
12.70 1.9
15.88 2.2
19.05 2.5
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
[Tighten]
Torque wrench
Spanner
Pipe union
Flare nut
6.40 (1/4") 18 (13.3)
9.52 (3/8") 42 (31.0)
12.70 (1/2") 55 (40.6)
15.88 (5/8") 65 (48.0)
19.05 (3/4") 78 (57.6)
Wall
Be sure to
place a cap.
If no flare cap is
available, co ver the
flare mouth with tape to
keep dirt or water out.
Inter-unit wire
Gas pipe
Liquid pipe
Gas pipe
insulation
Finishing tape
Drain hose
Rigid
0.7
1.0
1.3
1.7
2.0
Liquid pipe
insulation